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Influence of swimming behavior of copepod nauplii on feeding of larval turbot (Scophthalmus maximus)
- Source :
- Aquaculture International. 26:225-236
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- Feeding in larval fish is influenced by a range of factors and among these are the morphological and behavioral characteristics of their prey. We investigated the influence of the swimming behavior of two species of calanoid copepods, Acartia tonsa and Temora longicornis, on larval turbot feeding. The nauplii of these species represent two contrasting swimming behaviors: A. tonsa is a jump-sink type swimmer, while T. longicornis is a cruise swimming type. Three replicates of ten larvae aged 7 and 9 days post hatch (DPH) were observed feeding on one of the two copepod species using a 2-dimensional video setup. The results showed that the duration of aiming postures by turbot larvae was 2.3 times higher when turbot larvae approached T. longicornis as compared to A. tonsa nauplii, indicating that larvae can more easily position themselves, preparing for attack, when the prey is of the jump-sink type. The attack speed of turbot larvae feeding on A. tonsa nauplii decreased slightly from DPH 7 to DPH 9, whereas it increased when attacking T. longicornis nauplii. Capture success rate by turbot larvae feeding on A. tonsa was 58% and slightly higher, but not significantly different to capture success rate when feeding on T. longicornis (54%). We conclude that the differences between behavior and other characteristics of these prey species have only minor effect on larval fish feeding, suggesting that copepods species for live feed should be selected according to their ease to culture more than to their species-specific characteristics.
- Subjects :
- 0106 biological sciences
Larva
biology
ved/biology
010604 marine biology & hydrobiology
fungi
ved/biology.organism_classification_rank.species
Zoology
Live feed
04 agricultural and veterinary sciences
Aquatic Science
Ichthyoplankton
biology.organism_classification
01 natural sciences
Scophthalmus
Predation
Fishery
Turbot
040102 fisheries
0401 agriculture, forestry, and fisheries
human activities
Agronomy and Crop Science
Copepod
Acartia tonsa
Subjects
Details
- ISSN :
- 1573143X and 09676120
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Aquaculture International
- Accession number :
- edsair.doi...........9ed7ce908a64b55423b1047b9a29110a